Sylvia/docs/mobile

@lou-wang @remyedX @mhoeber @lamagnifica Please review. I still need to add screen shots; will do that Wednesday morning.

Built draft version at readthedocs: http://draft-mobile-faq.readthedocs.org/en/latest/SFD_mobileFAQ.html

Note: I'm thinking about making each question a heading so they'll stand out more; what are your thoughts?